About Y Chromosome DYS439(null)/L1/S26 (R1b1b2a1a1a3) (Thompson)
or Here: http://www.worldhistoria.com/haplogroup-iranian-kurdish-tribes_topic125205.html  R1b1b2a1a1c
This subclade is defined by the presence of the marker L1/S26/DYS439(null). It occurs in less than half of a percent of R1b males, mainly with roots in the south and east of England and in Germany. L1, first discovered by Family Tree DNA, then confirmed and named S26 by EthnoAncestry, is located in the flanking region of DYS439, and when it occurs, it inhibits the FTDNA primers from binding, thus producing an apparent null allele or null439.